(19)
(11) EP 2 088 765 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
21.10.2009 Bulletin 2009/43

(43) Date of publication A2:
12.08.2009 Bulletin 2009/33

(21) Application number: 09150930.7

(22) Date of filing: 20.01.2009
(51) International Patent Classification (IPC): 
H04N 5/202(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR
Designated Extension States:
AL BA RS

(30) Priority: 06.02.2008 JP 2008026223
11.12.2008 JP 2008315327

(71) Applicant: Canon Kabushiki Kaisha
Tokyo 146-8501 (JP)

(72) Inventor:
  • Abe, Naoto
    Tokyo 146-8501 (JP)

(74) Representative: TBK-Patent 
Bavariaring 4-6
80336 München
80336 München (DE)

   


(54) Image signal processing apparatus and image signal processing method


(57) An image signal processing apparatus has an inverse γ-conversion unit (4) for receiving γ-converted video signals and subjecting the video signals to processing for canceling γ-conversion characteristics, and a conversion unit (4a) for generating floating point data from fixed point type data which is proportional to luminance as an output from the inverse γ-conversion unit to transfer the floating point data or to subject the floating point data to reference table processing or signal processing, wherein the floating point data has a significand and an exponent, and the radix of the exponent is 4.







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